Exercise: Communication Systems

Questions for: Communication Systems

Which of the following is a better recording medium?
A:
Ferric oxide
B:
Ferrous oxide
C:
Chromium di oxide
D:
Either (a) or (b)
Answer: C

Chromium di oxide has very good retentivity.

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Convolution of x(t + 5) with impulse function δ(t - 7) is equal to
A:
x(t - 2)
B:
x(t + 12)
C:
x(t - 12)
D:
(t + 2)
Answer: A

Convolution of | x(t + s) with d(t - 7)

x(t - 7 + 5) x(t - 2).

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The number of possible colours with a 4 line digital input monitor are
A:
4
B:
16
C:
64
D:
2
Answer: B

24 = 16.

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In VHS format each video head is tilted from azimuth by
A:
20°
B:
10°
C:
6°
D:
1°
Answer: C

Tilting of heads is done to reduce cross-talk.

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Assertion (A): CCIR-B system has 625 scanning lines per frame and 2 : 1 interlace.

Reason (R): The aspect ratio is 4 : 3

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: B

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